How a many-body quantum system thermalizes --or fails to do so-- under its own interaction is a fundamental yet elusive concept. Here we demonstrate nuclear magnetic resonance observation of the emergence of prethermalization by measuring out-of-time ordered correlations. We exploit Hamiltonian engineering techniques to tune the strength of spin-spin interactions and of a transverse magnetic field in a spin chain system, as well as to invert the Hamiltonian sign to reveal out-of-time ordered correlations. At large fields, we observe an emergent conserved quantity due to prethermalization, which can be revealed by an early saturation of correlations. Our experiment not only demonstrates a new protocol to measure out-of-time ordered correlations, but also provides new insights in the study of quantum thermodynamics.
From stable periodic orbits to many-body chaos: doubly tunable prethermalization via engineering of an emergent band structure
State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University（北京大学物理学院人工微结构和介观物理国家重点实验室）；Max Planck Institute for the Physics of Complex Systems（马克斯·普朗克复杂系统物理研究所）；Cavendish Laboratory, University of Cambridge（剑桥大学卡文迪许实验室）；Technical University of Munich, TUM School of Natural Sciences, Physics Department（慕尼黑工业大学自然科学院物理系）；Munich Center for Quantum Science and Technology (MCQST)（慕尼黑量子科学与技术中心）
Università degli Studi di Padova（帕多瓦大学）；Istituto Nazionale di Fisica Nucleare, Sezione di Padova（意大利国家核物理研究所帕多瓦分部）；Padua Quantum Technologies Research Center（帕多瓦量子技术中心）
Non-equilibirum physics of density-difference dependent Hamiltonian: Quantum Scarring from Emergent Chiral Symmetry
Laboratoire Kastler Brossel, Collège de France, CNRS, ENS-Université PSL, Sorbonne, Université（卡斯特尔-布罗塞尔实验室，法兰西学院，法国国家科学研究中心，巴黎文理研究大学，索邦大学）；Department of Physics, University of Tokyo（东京大学物理学系）；Institute for Physics of Intelligence, University of Tokyo（东京大学智能物理研究所）；Trans-Scale Quantum Science Institute, University of Tokyo（东京大学跨尺度量子科学研究所）；Advanced Institute for Materials Research (WPI-AIMR), Tohoku University（东北大学先进材料研究所（WPI-AIMR））
Atom-light crystallization of BECs in multimode cavities: Nonequilibrium classical and quantum phase transitions, emergent lattices, supersolidity, and frustration
Negative Interaction Quench Dynamics of Density-Ordered Dipolar Bosons in a One-Dimensional Optical Lattice
University of Haifa（海法大学）；The Maharaja Sayajirao University of Baroda（巴罗达马哈拉贾·萨亚吉拉奥大学）；Universidade Federal de Pernambuco（伯南布哥联邦大学）；Universidade de São Paulo（圣保罗大学）
